I have been doing some URANS-calculations using different turbulence models and would now like to display the eddy viscosity. This is not possible directly because the nut-field data has not been written. Using paraview's calculator is also not an adequate option...

Is there a utility for calculating the eddy viscosity field afterwards?

thank you very much! Unforunatelly I'm a newby to C++ and so there's still a question:
Is Cmu a constant in your utility or is it calculated (for non-linear turbulence modells like realizable-k-epsilon)?